Methods and systems are provided for forming a cathode pre-lithiation layer for a lithium-ion battery. In one example, a slurry for forming the cathode pre-lithiation layer may include a solvent including a uniform dispersion of a nanoscale cathode pre-lithiation reagent. The slurry may be cast onto a porous cathode active material layer and dried and calendered to form the cathode pre-lithiation layer. In some examples, the slurry may have a viscosity of up to 5000 cP at a shear rate of 100 s.sup.−1. In this way, delamination and interfacial impedance between the cathode pre-lithiation layer and the porous cathode active material layer may be reduced relative to a higher viscosity cathode pre-lithiation layer having a larger scale cathode pre-lithiation reagent cast onto a non-porous or low-porosity cathode active material layer.

A battery case is provided, including a plurality of side plates. A first side plate has the largest area among the plurality of side plates, and at least one first side plate includes a first portion and a second portion. The first portion is a curved surface concave toward inside of the battery case. A three-dimensional coordinate system is established in a first direction, a second direction, and a third direction, and the second direction is perpendicular to the first side plate. A curvature of the first portion is less than a curvature of an ellipsoid, the curvature of the ellipsoid is obtained from an ellipsoid function, and the ellipsoid function is: ((x−a)/i).sup.2+((y−b)/j).sup.2+((z−c)/k).sup.2=1, where, a, b, c, i, j, and k are determined according to coordinates of at least four points that are different from each other, and x, y, and z are coordinates of the three directions of the ellipsoid function.

The present invention has as its object the provision of a battery material stacking system able to stack sheet-shaped workpieces relating to battery materials continuously at a high speed. The system is comprised of a conveyance mechanism 1 conveying sheet-shaped workpieces W relating to battery materials in a predetermined direction, a placement mechanism 2 placing workpieces W, and a stacking mechanism 3 stacking workpieces W. The placement mechanism 2 comprises a stator 21 of a linear motor having a predetermined running rail, a plurality of movers 22 of a linear motor provided at the stator 21, pickup members 23 provided at the movers 22 and picking up the workpieces W, and a control part 100 controlling running of the movers 22 at the stator 21. The pickup members 23 pick up the workpieces W conveyed from the conveyance mechanism 1 and rotationally convey the workpieces W along with the movers 22 running along the running rail of the stator 21, then stacking the workpieces W on the stacking mechanism 3.

Set forth herein are electrochemical cells which include a negative electrode current collector, a lithium metal negative electrode, an oxide electrolyte membrane, a bonding agent layer, a positive electrode, and a positive electrode current collector. The bonding agent layer advantageously lowers the interfacial impedance of the oxide electrolyte at least at the positive electrode interface and also optionally acts as an adhesive between the solid electrolyte separator and the positive electrode interface. Also set forth herein are methods of making these bonding agent layers including, but not limited to, methods of preparing and depositing precursor solutions which form these bonding agent layers. Set forth herein, additionally, are methods of using these electrochemical cells.

The present invention provides an electrode assembly in which a negative electrode coated with a negative electrode active material on a surface of a negative electrode collector, a separator, and a positive electrode coated with a positive electrode active material on a surface of a positive electrode collector are repeatedly laminated, the electrode assembly comprising: monocells in which the positive electrode, the separator, the negative electrode, and the separator are laminated, wherein at least two or more monocells are laminated, wherein, in any one of the monocells, an expansion part extending lengthily to one side is formed on the separators, and the expansion part of the separator surrounds the monocells laminated to be disposed at the outermost layers to fix the laminated monocells.

A power storage device includes: a module stacked body including at least one power storage module including a plurality of stacked electrodes; and a housing constituting a first sealed space for accommodating the module stacked body, wherein the housing has a housing body including a cylindrical side wall extending along a stacking direction in the module stacked body and a plate-shaped bottom wall closing one end of the side wall and a lid being joined to the other end of the side wall and constrains the module stacked body in the stacking direction of the electrode inside the first sealed space by deforming at least a portion of the bottom wall and the lid so as to come close to each other due to an air pressure difference between the inside and outside of the first sealed space.

A battery plate having a substrate with opposing surfaces and one or more nonplanar structures and one or more active materials disposed on at least one of the opposing surfaces; wherein the battery plate includes one or more of: i) one or more projections disposed within but do not extend beyond the active material; ii) one or more projections which project beyond the active material and substantially free of the active material or dust formed from the active material; and/or iii) a frame about the periphery of the substrate which projects beyond the active material and is substantially free of the active material or dust formed from the active material; and wherein the battery plate is adapted to form part of one or more electrochemical cells in a battery assembly.

A sealed secondary battery cell that is chargeable between a charged state and a discharged state is provided. The sealed secondary battery cell comprises a hermetically sealed enclosure comprising a polymer enclosure material, an electrode assembly enclosed by the hermetically sealed enclosure, a set of electrode constraints, and a rated capacity of at least 100 mAmp.Math.hr. A thermal conductivity of the secondary battery cell along a thermally conductive path between the vertically opposing regions of the external vertical surfaces of hermetically sealed enclosure in the vertical direction is at least 2 Wm.Math.K.

A battery pack includes a sub-end plate disposed between a cell stack and a main end plate. The sub-end plate includes a first surface that faces the cell stack, and a second surface that faces the main end plate. A contact portion that protrudes toward and comes into contact with the main end plate, and a non-contact portion that is positioned laterally with respect to the contact portion, and forms a space between the non-contact portion and the main end plate and does not come into contact with the main end plate at least when the main end plate is not elastically deformed in a direction away from the cell stack by being pressed by the contact portion are formed on the second surface.

The positive electrodes each have a core-body exposed part at which a positive electrode core body is exposed, and a base part in which a composite material layer is formed on at least one surface of the positive electrode core body. The base part has formed therein a first region in which an active material is embedded in the positive electrode core body and a second region in which the the average embedment depth of active material embedded in the positive electrode core body is smaller than that in the first region. The second region is formed adjacent to the core-body exposed part.